Producing amino-anthraquinones and derivatives thereof.



UNITE D TATES PATENT OFFICE.

CHRISTIAN RAMPI'NI, DECEASED, BY WILLIAM E. WARLAND, ADMINISTRATOR, I BROOKLYN, NEXV YORK, ASSIGNOR TO BADISCHE .ANILIN & SODA FABRIK,

LUDWIGSHAFEN-ONTHE-RHINE, GERMANY.

PRODUCING AMINO-ANTHRAQUINONES AND DERIVATIVES THEREOF.

No ")rawing.

To all whom it may concern:

Be it known that HLLIAM E. \VARLAND, a citizen of the United States, residing at .lh'ooltlyn, in the county of Kings and State oflfiew York. administrator of the estate of CHRISTIAN RAMPINI, deceased, late a subject of the King of Bavaria, believes that Cums- TYAN R'AMIINI (lid invent new and useful Improvements in Producing homo-Anthrauuinones and Derivatives Thereof, of which the following is a specification.

A [method of producing amino-anthra quinoncs is to heat the corresponding anihraquinonc sultonic acid with aqueous amm nia. so that the sulfonic acid group repla ed by the amino group. It. has now been found that the reaction proceeds much mor smoothly and that less byproducts are pr duced if, during the reaction. an oxidizin; agent, which does not atta: l; the main-:1 compound under the (:utlitionS existing during the process, be adccd to the reaction mixture. As instances of suitable oxidizing :1 its may be mentioned manganese perorid, cuprous oxid, cupric oxid, a bichroroute, arsenic oxid and silver oxid.

The following examples will serve to illustrate further the nature of this invention, which, however, is not limited to the examples given. The parts are by weight.

Example 1: Heat together, at 200 1, for ll hours, in an autoclave provided with a stirrer, parts of the sodium salt. of anthraquinoneflfrdisulfonic acid, 250 parts of 259"}, an'inionia solution. and 78 parts of copper sulfate. Then rte-crystallize the product, or extract it With dilute nitric acid. in order to remove the copper. The product consists of pure 2.6-diamino-anthraquin ne. In a similar manner, 2.7%lifl1lllIlO-{Ulthraquinone can be obtained from anthraquinoneQJ-disulfonic acid.

Example 2: Stir together, in an autoclave provided with a stirrer, 250 parts of the sodium salt. of anthraquinone-beta-sultonic acid (in the condition of a per cent. paste), 156 parts of 80% manganese dioxid and 130 parts of water. Then a 580 parts of 25% ammonia and heat for 2 hours at Specification of Letters Patent.

Patented May 27, J 913.

Application filed March 15, 1912. Serial No. 684,082.

i200 C. The beta-amino-anthraquinone I produced can be separated from the manga nese dioxid by treatment with sulfurous acid, or a hisultite, and is then dried. It melts at about 800 C. and the yield is almost theoretical.

Example 3: Heat together for from 20 to 24 hours, at 200 C., in an autoclavc provided with a stirrer. 230 parts of the sodium salt of anthraquinone-beta-sulfonic acid, 150 parts of sodium hichromate, 50 parts of ammonium chlorid, and (300 parts of 151.; ammonia. The reaction product, :itleiubeing freed from chromium oxid, is pure. In asiniilar manner. 1.5-diaminoanthraquinone and 1.S-diamino-anthraquin0ne can be obtained from the corresponding disui'fonie acids, and other derivatives of an li1lZi(,!!i!10llP. such for instance as the amino- :mthraquinone-sulfonic acids can be treated F .in like manner. In any case, instead of the l betaa11thraquinone-sulfonic acids, the corres 'ionding alpha-anthraquinone compounds can be employed, and the alpha-amino-an lhraquinones are obtained in such yield and of such purity as have not hitherto been obtained.

Now What is claimed is 1. The process of producing amino-anthraquinones by heating anthraquinone suh tonic acids with aqueous ammonia in the presence oi" an oxidizing agent.

2. The process of producing Qaunino-anthraquinone by heating anthraquinone-Q- sulfonic acid with aqueous ammonia in the presence of an oxidizing agent.

3. The process of producing Q-amino-anthratpiinone by heating anthraquinone-Q- sullonic acid with aqueous ammonia in the presence of copper sulfate.

In testimony whereof I have hereunto set my hand in the presence of two subscribing, witnesses.

\VILLTAM F. VVARLAND, .ls administrator of 'Christz'an Rampz'ni,

deceased. \Vitnesses Cums. H. ALMs'rAnDT, W ILLIA M MILLER. 

